Android Studio Error "Minimum supported Gradle version is 7.0.2. Current version is 6.8."

The error:

Minimum supported Gradle version is 7.0.2. Current version is 6.8.

Likely means:

• Your "gradle"-folder is missing from your project folder:
  (Note: Not to be mistaken for the ".gradle"-folder which is a different folder)

  Solution:
  Get a copy of the "gradle"-folder from another working project (or create a new project).

Or:

• Your "gradlewrappergradle-wrapper.properties" has an incorrect value in the "distributionUrl=":

  Solution:
  Change the value in "gradlewrappergradle-wrapper.properties" to
  distributionUrl=https://services.gradle.org/distributions/gradle-7.0.2-bin.zip

I hade the same problem after moving my project to another computer:

Minimum supported Gradle version is 7.0.2. Current version is 6.8.

Please fix the project’s Gradle settings.
Gradle Settings.

Clicking on the "Gradle Settings"-link opened the Gradle settings Window, but the Gradle JDK was already correctly set to version 11:

So my next step was to check the Project Structure:

And update the Gradle Version to 7.0.2:

But that led to this error instead:

¤ What went wrong:
An exception occurred applying plugin request [id: ‘com.android.application’]
» Failed to apply plugin ‘com.android.internal.version-check’.
» Minimum supported Gradle version is 7.0.2. Current version is 6.8. If using the gradle wrapper, try editing the distributionUrl in D:FilesCode-Projectgradlewrappergradle-wrapper.properties to gradle-7.0.2-all.zip

Now the error points me towards a problem within the "gradlewrappergradle-wrapper.properties"-file.

Looking into that I found out the real problem – the "gradle"-folder was completely missing.
(Note: The ".gradle"-folder is not the same as the "gradle"-folder)

Copying the "gradle"-folder from another project solved my problems.

Now my "gradlewrappergradle-wrapper.properties"-file looks like this: